及时

go while the going is good

remind sb just in time

give sb a timely warning

arrive in the very nick of time; arrive in time

sow in good time; sow at the right time

This snow has come at the right time.

A stitch in time saves nine.

timely/seasonable advice

Get prompt treatment when you are ill.

We shall inform you of the final results without delay.

He answered the letter immediately.

summarize experience promptly

notify sb at once

correct a mistake promptly

give an immediate reply

take prompt measures

compensate immediately for the loss